参考：https://blog.csdn.net/zhang_cherry/article/details/120121145
es6语法，浅拷贝转化为深拷贝！！！

let arr5 = [0, 0, 1]
let arr6 = [...arr5]
arr5[0] = 10000
console.log(arr5) // [10000, 0, 1]
console.log(arr6) // [0, 0, 1]